Add torrc option OnionService* alias for HiddenService*

Since the rebranding of Hidden Service to "Onion Service" is now a thing, it would make sense to add aliases for every hidden service torrc option to be changed to use "OnionService" instead. Here are the options I can find in tor man page:

HidServAuth --> OnionServiceAuth
HidServDirectoryV2 --> OnionServiceDirectoryV2
MinUptimeHidServDirectoryV2 --> MinUptimeOnionServiceDirectoryV2
VoteOnHidServDirectoriesV2 --> VoteOnOnionServiceDirectoriesV2
PublishHidServDescriptors --> PublishOnionServiceDescriptors
FetchHidServDescriptors --> FetchOnionServiceDescriptors

HiddenService* --> OnionService*

Just to be clear, it's NOT a renaming but we add an alias for the current options so both live together.